1# SPDX-License-Identifier: GPL-2.0-only 2 3config EROFS_FS 4 tristate "EROFS filesystem support" 5 depends on BLOCK 6 select LIBCRC32C 7 help 8 EROFS (Enhanced Read-Only File System) is a lightweight 9 read-only file system with modern designs (eg. page-sized 10 blocks, inline xattrs/data, etc.) for scenarios which need 11 high-performance read-only requirements, e.g. Android OS 12 for mobile phones and LIVECDs. 13 14 It also provides fixed-sized output compression support, 15 which improves storage density, keeps relatively higher 16 compression ratios, which is more useful to achieve high 17 performance for embedded devices with limited memory. 18 19 If unsure, say N. 20 21config EROFS_FS_DEBUG 22 bool "EROFS debugging feature" 23 depends on EROFS_FS 24 help 25 Print debugging messages and enable more BUG_ONs which check 26 filesystem consistency and find potential issues aggressively, 27 which can be used for Android eng build, for example. 28 29 For daily use, say N. 30 31config EROFS_FS_XATTR 32 bool "EROFS extended attributes" 33 depends on EROFS_FS 34 default y 35 help 36 Extended attributes are name:value pairs associated with inodes by 37 the kernel or by users (see the attr(5) manual page, or visit 38 <http://acl.bestbits.at/> for details). 39 40 If unsure, say N. 41 42config EROFS_FS_POSIX_ACL 43 bool "EROFS Access Control Lists" 44 depends on EROFS_FS_XATTR 45 select FS_POSIX_ACL 46 default y 47 help 48 Posix Access Control Lists (ACLs) support permissions for users and 49 groups beyond the owner/group/world scheme. 50 51 To learn more about Access Control Lists, visit the POSIX ACLs for 52 Linux website <http://acl.bestbits.at/>. 53 54 If you don't know what Access Control Lists are, say N. 55 56config EROFS_FS_SECURITY 57 bool "EROFS Security Labels" 58 depends on EROFS_FS_XATTR 59 default y 60 help 61 Security labels provide an access control facility to support Linux 62 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 63 Linux. This option enables an extended attribute handler for file 64 security labels in the erofs filesystem, so that it requires enabling 65 the extended attribute support in advance. 66 67 If you are not using a security module, say N. 68 69config EROFS_FS_ZIP 70 bool "EROFS Data Compression Support" 71 depends on EROFS_FS 72 select LZ4_DECOMPRESS 73 default y 74 help 75 Enable fixed-sized output compression for EROFS. 76 77 If you don't want to enable compression feature, say N. 78 79config EROFS_FS_CLUSTER_PAGE_LIMIT 80 int "EROFS Cluster Pages Hard Limit" 81 depends on EROFS_FS_ZIP 82 range 1 256 83 default "1" 84 help 85 Indicates maximum # of pages of a compressed 86 physical cluster. 87 88 For example, if files in a image were compressed 89 into 8k-unit, hard limit should not be configured 90 less than 2. Otherwise, the image will be refused 91 to mount on this kernel. 92 93